Optics 4 Question 10
10. A given ray of light suffers minimum deviation in an equilateral prism $P$. Additional prisms $Q$ and $R$ of identical shape and of the same material as $P$ are now added as shown in the figure. The ray will suffer
$(2001,2 M)$
(a) greater deviation
(b) no deviation
(c) same deviation as before
(d) total internal reflection
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Answer:
Correct Answer: 10. (c)
Solution:
- Figure (a) is part of an equilateral prism of figure (b) as shown in figure which is a magnified image of figure (c). Therefore, the ray will suffer the same deviation in figure (a) and figure (c).
NOTE
Questions are often asked based on part of a prism. For example, section shown in figure (a) is part of a prism shown in figure (c).
